What was found
AT CRUISE 31,000 FT NR 1 ENG LOST POWER-BEGAN TO SHUDDER OIL PSI, TEMP AND VIB, WERE NOT ABNORMAL, AT IDLE N1 WAS ABOUT 50 PERCENT EGT WAS 550 D C N2-70 PERCENT HYD PSI WAS BOTTOM OF YELLOW ARK REPLACED NR 1 ENG PER TASK CARD 29-7100-1-4900, OPS CHECK NORMAL NO LEAKS NOTED. SEE L/P 2140165 FOR PARTS CHANGE.